A Stereo-Atlas of Ostracod Shells edited by I. Boomer, D. J. Horne, A. R. Lord, D. J. Siveter, and J. E. Whittaker Volume 22, Part 2; 31st December, 1995 Published under the aegis of the British Micropalaeontological Society, London ISSN 0952-7451 Editors Dr Ian Boomer, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ. Tel: + 1603 592841; Fax: + 1603 507719; Email: i.boomer@uea.ac.uk. Dr David J. Horne, School of Earth Sciences, University of Greenwich, Chatham Maritime, Kent ME4 4AW. Tel: + 181 331 9841; Fax: + 181 331 9805; Email: d.j.horne@greenwich.ac.uk. Professor Alan R. Lord, Department of Geological Sciences, University College London, Gower Street, London WC1E 6BT. Tel: + 171 380 7131; Fax: + 171 388 7614; Email: dean.maps@ucl.ac.uk. Dr David J. Siveter, Department of Geology, The University, Leicester LEI 7RH. Tel: + 116 523925; Fax: + 116 523918; Email: djs@leicester.ac.uk. Dr John E. Whittaker, Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD. Tel: +171 938 8837; Fax: + 171 938 9277; Email: jepw@nhm.ac.uk. Editorial Board Dr J.-P. Colin, Esso Production Research - European, 213 Cours Victor Hugo, F-33321 Begles, France. Dr M.A. Ayress, Department of Geology, The Australian National University, G.P.O. Box 4, Canberra, ACT 2601, Australia. Professor R.F. Lundin, Department of Geology, Arizona State University, Tempe, Arizona 85287-1404, U.S.A. Dr R.E.L. Schallreuter, Geologisches-Palaontologisches Institut, Universitat Hamburg, Bundesstrasse 55, D-20146 Hamburg, Germany. Professor N. Ikeya, Institute of Geosciences, Shizuoka University, Shizuoka 422, Japan. Officers of the British Micropalaeontological Society Chairman: Dr R.J. Aldridge, Department of Geology, University of Leicester, Leicester, LEI 7RH. Secretary: Mrs S.L. Matthews, c/o Department of Geological Sciences, University College London, Gower Street, London WC1E 6BT. Treasurer: Dr J.B. Riding, British Geological Survey, Keyworth, Nottingham NG12 5GG. Membership Treasurer: Dr L.T. Gallagher, Network Stratigraphic Consulting Ltd., Unit 57, The Enterprise Centre, Cranborne Road, Potters Bar, Hertfordshire EN6 3DQ. Editor, Journal of Micropalaeontology: Professor J.W. Murray, Department of Geology, Southampton Oceanogra- phy Centre, Empress Dock, Southampton S014 3ZH. Editor, Newsletter of Micropalaeontology: Dr A.J. Powell, Millenia Ltd., Unit 3, Weyside Park, Newman Lane, Alton, Hampshire GU34 2PJ. Calcareous Nannofossil Group: Chairman - Dr J.A. Burnett; Secretary - Ms D.E. Windley. Conodont Group: Chairman - Dr S.J. Tull; Secretary - Dr I.J. Sansom. Foraminifera Group: Chairman - Dr M.A. Kaminski; Secretary - Mr M.D. Bidgood. Ostracod Group: - Chairman - Dr D.J. Horne; Secretary - Dr M. Williams. Palynology Group: Chairman - Professor D.J. Batten; Secretary - Mr D. McLean. Instructions to Authors Contributions illustrated by scanning electron micrographs of Ostracoda in stereo-pairs are invited. All contributions submitted for possible publication in A Stereo-Atlas of Ostracod Shells are peer-reviewed by an appropriate inter- national specialist. “Instructions to Authors” and plate blanks for mounting photographs may be obtained from any Editor. Manuscripts should be submitted to Dr Ian Boomer. The front cover shows (upper) the holotype (RV, dorsal view, BMNH no. OS 14654) and (lower) a paratype (LV, external lateral view, BMNH no. OS 14653) of Pariceratina ubiquita Boomer, 1994 from the Palaeogene of ODP Site 865, Central Pacific Ocean. This species was described in A Stereo-Atlas of Ostracod Shells, 21, 79-86. A Stereo-Atlas of Ostracod Shells edited by I. Boomer, D. J. Horne, A. R. Lord, D. J. Siveter, and J. E. Whittaker Volume 22, 1995 Part 1 (pp. 1-61); 31st August, 1995 Part 2 (pp. 62-126); 31st December, 1995 For the purposes of taxonomic priority it should be noted that this issue was actually published on 31 March, 1996, having been delayed beyond the date shown on the cover. Published under the aegis of the British Micropalaeontological Society, London Stereo-Atlas of Ostracod Shells 20, ii Contents Contents 1 On Baltocyamus primarius Meidla gen. et sp. nov.; by T. Meidla. 1 2 On Dizygop/eura landesi Roth; by R.F. Lundin. 5 3 On Longiscella grandis (Jones & Holl); by L.E. Petersen & R.F. Lundin. 9 4 On Microcheilinella gigas Birkmann & Lundin sp. nov.; by Birkmann & R.F. Lundin. 13 5 On Ordovizona immanis Becker; by G. Becker. 17 6 On Inversibolbina lehnerti Schallreuter gen. et sp. nov.; by R.E.L. Schallreuter. 21 7 On Artesiocythere artesica Krommelbein; by C.A. Maybury & R.C. Whatley. 25 8 On Allarue/la australiensis Krommelbein; by C.A. Maybury, R.C. Whatley & S. Ballent. 29 9 On Arcacythere rugosa Majoran sp. nov.; by S. Majoran. 33 10 On Kuiperiana paravariesculpta Maybury; by C.A. Maybury. 37 11 On Cytheropteron bronwynae Joy & Clark; by R. Jones & R.C. Whatley. 41 12 On Cytherelloidea kayei Weaver; by D.J. Horne, A. Rosenfeld & I. Slipper. 45 13 On Semicytherura complanata (Brady, Crosskey & Robertson); by D.J. Horne & A.R. Lord. 53 14 On PolonieUa schallreuteri Lundin nom. nov.; by R.F. Lundin. 61 15 On Kotoracythere tatsunokuchiensis Ishizaki; by M. Huh, R.C. Whatley & K-H. Paik. 62 16 On Kotoracythere koreana Huh, Whatley & Paik sp. nov.; by M. Huh, R.C. Whatley & K-H. Paik. 66 17 On Cavhithis cavi Schallreuter; by R.E.L. Schallreuter. 70 18 On Spinodiphores praepletus Schallreuter gen. et sp. nov.; by R.E.L. Schallreuter. 74 19 On Ansipe anseripediculus Schallreuter gen. et sp. nov.; by R.E.L. Schallreuter. 78 20 On Harpabollia argentina Schallreuter sp. nov.; by R.E.L. Schallreuter. 82 21 On Juraleberis jubata Vannier & Siveter gen. et sp. nov.; J. Vannier & D.J. Siveter. 86 22 On Kirkbyrhiza primaeva (Roth); by G. Becker & R.F. Lundin. 96 23 On Polycope moenia Joy & Clark; by R. Jones & R.C. Whatley. 104 24 On Cytheropteron nudum Boomer sp. nov.; by I. Boomer. 108 25 On Eucytherura al/isonensis Boomer sp. nov.; by I. Boomer. 112 26 On Hemiparacytheridea larwoodi Boomer sp. nov.; by I. Boomer. 116 27 On Limnocythere eiggensis Wakefield sp. nov.; by M.I. Wakefield. 120 28 Index for Volume 22, (1995). 124 Stereo-Atlas of Ostracod Shells 22 (15) 62-65 (1995) Kotoracythere tatsunokuchiensis (1 of 4) 595.337.14 (118.22) (520 : 161 . 140.38) : 551 .35 + 552.54 ON KOTORACYTHERE TATSUNOKUCHIENSIS ISHIZAKI by Min Huh, Robin C. Whatley & Kwang-Ho Paik (Department of Geology, Chonnam National University, Kwangju, Korea; Institute of Earth Studies, University of Wales, Aberystwyth, U.K. & Department of Earth and Environmental Sciences, Korea University, Seoul, Korea) Kotoracythere tatsunokuchiensis Ishizaki, 1966 1966 Kotoracythere tatsunokuchiensis sp. nov., K. Ishizaki, Sci. Rep. Tohoku (Jniv., 2nd Ser. (Geol.), 37, 2, pi. 18, figs. 13, 14, text-fig. 1, fig. 8. 1992 Kotoracythere sp.; M. Huh & K.H. Paik, J. paleont. Soc. Korea , Special Publ. 1, pi. 3, figs. 4, 5. 1994 Kotoracythere sp.; M. Huh & K.H. Paik & E.H. Lee, J. paleont. Soc. Korea , 10, 1, pi. 1, figs. 3, 4. Holotype: Type locality: Figured specimens: Diagnosis: Institute of Geology and Paleontology, Tohoku University, Sendai, Japan, no. IGPS 87014; RV. [paratype, no. IGPS 87015], Down stream of the Tatsunokuchi gorge in the western part of Sendai City, Miyagi Pref., Japan, Tatsunokuchi Formation, Sendai Group; Pliocene. Department of Geology, Chonnam National University (CNU), nos. CNU-O- 544 (paratype, RV: PI. 22, 63, fig. 1; PI. 22, 65, fig. 3), CNU-O- 545 (LV: PI. 22, 63, fig. 2), CNU-O- 546 (LV: PI. 22, 63, fig. 3), CNU-O- 547 (LV: PI. 22, 65, fig. 1), CNU-O- 548 (LV: PI. 22, 65, fig. 2). CNU-O- 544 from the type locality, CNU-O- 545-548 from sample MC1-3, the lower Yeonil Group (Miocene), Pohang Basin, SE Korea (lat. 35° 50' 20" N, long. 129° 17'25"E) (see M. Huh & K.H. Paik, 1992, op. cit.). A medium sized species of Kotoracythere. Anterior margin broadly rounded, posterior margin truncated or subrounded, dorsal margin slightly arched. Surface ornamented with moderate reticulation. Weakly developed Explanation of Plate 22, 63 Fig. 1, RV, ext. lat. (paratype, CNU-O- 544, 570 pm long). Fig. 2, LV, ext. lat. (CNU-O- 545, 570/rm long). Fig. 3, car., ext. It. lat. (CNU-O- 546, 570 pm long). Scale A (200 gm; X101), figs. 1, 2; scale B (200^m; x99), fig. 3. Stereo-Atlas of Ostracod Shells 22, 64 Kotoracythere tatsunokuchiensis (3 of 4) Remarks: Distribution: A ckn o w ledge men t: longitudinal ribs with anterior- and posterior marginal ribs. A ventro-lateral rib terminates in a posteroventral, acutely pointed sub-alar protuberance. Calcified inner lamellar wide anteriorly and posteroventrally. Vestibulum wide anteroventrally. Pentodont hinge with separated distal teeth at each end of the median hinge bar in the left valve. Fulcral point subrounded. Marginal pore canals few, simple. Ishizaki (1966, op. cit.) described this species from the Pliocene deposits of Japan and suggested that its presence was probably due to the cooler water conditions prevailing during the Pliocene. However, our specimens come from the warmer, Miocene deposits of SE Korea. The Japanese Pliocene material is more compressed posterodorsally and has a less prominent sub-alar process than the present specimens. This species differs from the genotype of Kotoracythere, K. abnorma Ishizaki (1966, ibid. , see T. Hanai et al.. Checklist of Ostracoda from Japan and its adjacent Seas, Bull. Univ. Mus., Tokyo, 12, pi. 2, figs. 6-8, 1977) described from the Miocene Hatatate Formation of Sendai Area, Japan in its more subdued surface ornament with less prominent ribs, the wider and narrower anterior and posteroventral vestibula, the less numerous marginal pore canals and in having the separated teeth-like distal thickenings of the median hinge bar in the left valve. The present species is easily distinguished from K. koreana Huh, Whatley & Paik, 1995 (see M. Huh, R.C. Whatley & K.H. Paik, Stereo-Atlas Ostracod Shells, 22, 16, 1995) from the Lower Yeonil Group of the Pohang Basin (Miocene), SE Korea by its delicate surface ornament with less prominent marginal ribs. The specimen sent to us by Ishizaki (CNU-O- 544, PI. 22, 63, fig. 1; PI. 22, 65, fig. 3) is one of the three specimens from which he described the species in 1966. Although Ishizaki did not so designate it, it is by definition a paratype. Previous records are from the Pliocene of the Tatsunokunchi Formation, Sendai Area, Japan (see K. Ishizaki, 1966, op. cit.). We have also found it at Yongrak Village around the Mulcheonri Area near Kyongju City, where Miocene deposits of the Pohang Basin, SE Korea are exposed. We thank Professor K. Ishizaki (Tohoku University, Sendai, Japan) for providing a type specimen and for his helpful suggestions. Support from the Basic Science Research Institute Program, Ministry of Education, Korea, 1995 is gratefully acknowledged. Explanation of Plate 22, 65 Fig. 1, LV, ext. lat. (CNU-O- 547, 550 pm long). Fig. 2, LV, int. lat (CNU-O- 548, 590 //m long). Fig. 3, RV, int. lat. (paratype, CNU- 0-544, 570 /im long). Scale A (200 /un; xlOl), figs. 1-3. Stereo-Atlas of Ostracod Shells 22, 63 Kotoracythere tatsunokuchiensis (2 of 4) Stereo-Atlas of Ostracod Shells 22 (16) 66-69 (1995) Kotoracythere koreana (1 of 4) 595.337.14 (118.21) (519 : 161 .129.36) : 551 .35 + 552.54 ON KOTORACYTHERE KOREANA HUH, WHATLEY & PAIK sp. nov. by Min Huh, Robin C. Whatley & Kwang-Ho Paik (Department of Geology, Chonnam National University, Kwangju, Korea; Institute of Earth Studies, University of Wales, Aberystwyth, U.K. & Department of Earth and Environmental Sciences, Korea University, Seoul, Korea) Kotoracythere koreana sp. nov. 1992a Kotoracythere abnorma Ishizaki; M. Huh & K.H. Paik, J. geol. Soc. Korea, 28, 3, pi. 1. figs. 2, 3. 1992b Kotoracythere abnorma Ishizaki; M. Huh & K.H. Paik, J. paleont. Soc. Korea , Special Publ. 1, pi. 1, figs. 2, 3. 1994 Kotoracythere cf. abnorma Ishizaki; T. Irizuki & T. Matsubara, J. geol. Soc. Japan, 100, 2, pi. 1, fig. 2. non 1966 Kotoracythere abnorma Ishizaki; K. Ishizaki, Sci. Rep. Tohoku Univ., 2nd Ser. (Geol.), 37, 2, pi. 18, figs. 10-12, text-fig. 1, 9. Holotype: Type locality: Derivation of name: Figured specimens: Department of Geology, Chonnam National University (CNU), Kwangju, Korea, no. CNU-O- 540: 9 carapace, [paratypes, nos. CNU-O- 540-543] About 1 km northwest of Songhak Village, Hakgeondong Area, in the northwestern part of Pohang City, S.E. Korea (lat. 36°02'50"N, long. 129° 17'50"E), Lower Yeonil Group of the Pohang Basin; Miocene. With reference to the occurrence of the species in the Korean Peninsula. Department of Geology, Chonnam National University (CNU), nos. CNU-O- 540 (holotype, 9 carapace: PI. 22, 67, figs. 1, 2), CNU-O- 541 (paratype, 9 LV: PI. 22, 67, fig. 3), CNU-O- 542 (paratype, o* LV: PI. 22, 69, fig. 1), CNU-O- 543 (paratype, 9 LV: PI. 22, 69, figs. 2-4). All specimens from the type locality. CNU-O- 540 and CNU-O- 541 from sample HJ-1, CNU-O- 542 from HJ-3 and CNU-O- 543 from HJ-2 (Sample names after M. Huh & K.H. Paik, 1992a, b, op. cit.). Explanation of Plate 22, 67 Figs. 1, 2, 9 car. (holotype, CNU-O- 540, 540 pm long): fig. 1, ext. rt. lat.; fig. 2, ext. It. lat. Fig. 3, 9 LV, ext. lat. (paratype, CNU-O- 541, 520 pm long). Scale A (200 //m; X101), figs. 1, 3; scale B (200 //m; x95), fig. 2. Stereo-Atlas of Ostracod Shells 22, 68 Kotoracythere koreana (3 of 4) Diagnosis: Remarks: Distribution: A cknowledgemen t: A medium sized, dimorphic species of Kotoracythere. Posterior margin more truncated in right valve than in other species of this genus. Anterior margin broadly rounded, dorsal margin slightly arched. Ornament with a reticulum comprising irregularly-shaped fossae and numerous longitudinal ribs: anterior marginal rib parallel to anterior margin with a vertical anterodorsal rib, a ventro-lateral rib and a posteroventral, acutely pointed, sub-alar protuberance. Five or six distinct longitudinal ribs occur in the posterior half of valve. Caudal process distinct. Hingement pentodont and of the K. tatsunokuchiensis type (M. Huh, R.C. Whatley & K.-H. Paik, Stereo-Atlas Ostracod Shells, 22, 62-65, 1995); the upper part of the anterior median element in left valve rounded. Fulcral point subcircular. This species is similar to the genotype of Kotoracythere, K. abnorma Ishizaki, 1966 (ibid.). (See T. Hanai et al.. Checklist of Ostracoda from Japan and its adjacent Seas, Bull. Univ. Mus. Tokyo, 12, pi. 2, figs. 6-8, 1977) from the Miocene Hatatate Formation of Sendai Area, Japan but differs in the developmental and the distribu- tion pattern of its ribs and the distal structure of the median hinge elements. By virtue of the separated terminal elements of the median bar, this species resembles K. tatsunokuchiensis Ishizaki, 1966 but the latter is easily distinguished by its delicate surface ornament with less prominent ribs. The present species also differs from K. inconspicua (Brady, 1880) (see L. Witte & D. Van Harten, J. Biogeogr. 18, 427-436, 1991) by its less characteristic ornamentation with irregularly-shaped fossae, numerous longitudinal ribs, absence of posterior denticulations and larger size. Known from four samples from two localities in the Lower Yeonil Group (Miocene) of the Pohang Basin, SE Korea (for details of localities see Huh & Paik, 1992a, b, op. cit.). Support from the Basic Science Research Institute Program, Ministry of Education, Korea, 1994 is gratefully acknowledged. Explanation of Plate 22, 69 Fig. 1, cr LV, ext. lat. (paratype, CNU-O- 542, 560 //m long). Figs. 2-4, 9 LV (paratype, CNU-O- 543, 550/im long): fig. 2, int. lat.; fig. 3, ant. hinge; fig. 4, post, hinge. Scale A (200 gm; xlOl), figs. 1, 2; scale B (25 gm; x424), figs, 3, 4. Stereo-Atlas of Ostracod Shells 22, 67 Kotoracythere koreana (2 of 4) Stereo-Atlas of Ostracod Shells 22, 69 Kotoracythere koreana (4 of 4) Stereo-Atlas of Ostracod Shells 22 (17) 70-73 (1995) Cavhithis cavi (1 of 4) 595.336.13 (113.31) (438 : 161.018.54): 551.351 + 552.54 ON CA VHITHIS CA VI SCHALLREUTER by Roger E.L. Schallreuter (University of Hamburg, Germany) Genus CA VHITHIS Schallreuter Type-species (by original designation): Cavhithis cavi Schallreuter, 1965 Small (adults < 1 mm) Hithinae hollinaceans; S2 forms a cavum. No distinct preadductorial node. Posteroventral lobe distinctive in terminating posteriorly in a short spine. Velum in tecnomorphs is either markedly reduced to form a very narrow ridge anteriorly or is absent. Females with a markedly convex dolon, forming a ‘false brood pouch’ in anterior and central part of the ventral half of the valve. Marginal structure in right valve forms a broad, convex flange, missing in the region of the brood pouch. Surface reticulate. The dolon does not extend exactly to the contact plane throughout its length; posteriorly and also mid-ventrally the margin of the pouch is concave. The border of the dolon is not incomplete in the holotype as was assumed originally (R.E.L. Schallreuter, Palaeontographica, (A), 144, 73, 1973). Presumably two openings are present in closed female caparaces. The function of these openings is spearlative; maybe they were to allow a stream of water for the brood in the pouch, even in closed carapaces. Explanation of Plate 22, 71 Fig. 1, female RV ext. lat. (AGH 142-1, 0.70 mm long). Fig. 2, tecnomorphic RV ext. lat. (AGH 142-2, 0.61 mm long). Fig. 3, tecnomorphic LV ext. lat. (AGH 142-3, 0.60 mm long). Scale A (100 gm; x93), fig. 1; scale B (100 gm\ xl05), figs. 2, 3. Diagnosis: Remarks: Stereo-Atlas of Ostracod Shells 22, 72 Cavhithis cavi (3 of 4) Cavhithis cavi Schallreuter, 1965 1965 Cavhithis cavi sp. n., R.E.L. Schallreuter, Ber. geol. Ges. DDR , 10, 482-483, pi. 10, fig. 2, text-fig. la-b. 1970 Cavhithis cavi\ R.E.L. Schallreuter, HERCA, table 2 (pp. 290/1). 1973 Cavhithis cavi Schallreuter; R.E.L. Schallreuter, Palaeontographica, (A), 144 (1/3), 73-74, table 4, pi. 16, figs. 3-8, pi. 21, fig. 3. 1973 Cavhithis cavi Schallreuter; W Neben & H.H. Krueger, Staringia, 2, pi. 90, fig. 6 (= R.E.L. Schallreuter 1973, pi. 16, fig. 4). 1983 Cavhithis cavi Schallreuter; R.E.L. Schallreuter, Palaeontographica, (A), 180 (4/6), 172. 1983 Cavhithis cavi Schallreuter; R.E.L. Schallreuter, in R.F. Maddocks (Ed.), Applications of Ostracoda, Proc. 8th Internat. Symp. Ostracoda, 659, fig. 1. Univ. Houston, Texas. 1986-7 Cavhithis cavi Schallreuter; E.K. Kempf, Sonderveroff. geol. Inst. Univ. Koln, 50, 165, 51, 121; 52, 458. 1987 Cavhithis cavi Schallreuter; R.E.L. Schallreuter, N. Jb. Geol. Palaont. Abh., 174 (1), 24. Holotype: Type locality: Figured specimens: Diagnosis: Distribution: Geoloisch-Palaontologisches Institut, University of Greifswald, Germany, no. 15/4; a female left valve. A glacial erratic boulder (geschiebe) from Teschenhagen, near Stralsun, Pomerania; lat. 54° 18.8' N, approximately long. 13°7.2'E. Lower Upper Viruan (C3/D,; =Caradoc) ‘series’. Archiv fur Geschiebekunde, Geologisch-Palaontologisches Institut und Museum, University of Hamburg (AGH), Germany, nos. G 142-1 (9 RV: PI. 22, 71, fig. 1), G 142-2 (tecnomorphic RV: PI. 22, 71, fig. 2), G 142-3 (tecnomorphic LV: PI. 22, 71, fig. 3), G 142-4 (9 RV: PI. 22, 73, fig. 1), G 142-5 (tecnomorphic RV: PI. 22, 73, fig. 2) and G 142-6 (9 LV: PI. 22, 73, fig. 3). All from lower Upper Viruan Backsteinkalk geschiebe no. Jasl7, from the beach at Rixhoft, Jastrzebia Gora, Poland approx, lat. 54° 51' N, long. 18° 18' E; collected by the author in 1985 (R.E.L. Schallreuter 1987, op. cit., 24-25). As for genus, which is presently monotypic. Baltic types of the early Late Viruan (C3/D,; =Caradoc) ‘series’, Ordovician, Backsteinkalk geschiebes of northern Central Europe. Explanation of Plate 22, 73 Fig. 1, female RV int. lat. (AGH 142-4, 0.71mm long). Fig. 2, tecnomorphic RV int. lat. (AGH 142-5, 0.42 mm long). Fig. 3, posteriorly incomplete female LV (AGH 142-6, >0.64 mm long). Scale A (100 pm; xlOO), figs. 1, 3; scale B (100 pm; xl50), fig. 2. Stereo-Atlas of Ostracod Shells 22, 71 Cavhithis cavi (2 of 4) Stereo-Atlas of Ostracod Shells 22 (18) 74-77 (1995) Spinodiphores praepletus (1 of 4) 595.336.12 (113.31) (82 : 164.069.32): 551.351 +552.55 ON SPINODIPHORES PRAEPLETUS SCHALLREUTER gen. et sp. nov. by Roger E.L. Schallreuter (University of Hamburg, Germany) Genus SPINODIPHORES gen. nov. Type-species: Spinodiphores praepletus gen. et sp. nov. Derivation of name: From Latin, spina , spine and nodus, node; plus suffix -phores as in Klimphores; gender, masculine. Diagnosis: Elongate, preplete bollid drepanellacean; free margin centroventrally very slightly concave to slightly convex. In dorsal half, anteriorly, an oval node occurs at some distance from dorsal margin; posteriorly, and closer to dorsal margin, a short spine occurs and may protrude beyond the hinge line. The node and spine are joined by an indistinct, flat, broad connecting lobe. Bend at junction of lateral and marginal surfaces has an indistinct, rounded pseudovelum. Valve surface reticulate. Remarks: This genus is characterized by its preplete outline, reticulation and by the size, shape and development of its dorsal nodes. In its centrodorsal node and spine Spinodiphores resembles certain species of Pseudulrichia, for example P. ullehmanni Schallreuter, 1981 ( Geol . For. Stockh. Forh., 103, 69, fig. 9) or P. sp. aff. norvegiva of Blumenstengel, 1965 ( Freiberger ForschHft., (C) 182, 69, fig. 13, pi. 1, fig. 3). Spinodiphores differs fundamentally by its elongate shape, preplete outline, its sometimes slightly concave centroventral margin, its steeper marginal surface, weak pseudovelum and reticulation. In its steep marginal surface and the development of the pseudovelum S. praepletus resembles the Ordovician type-species Klimphores planus Schallreuter, 1966 (see R.E.L. Schallreuter, Stereo-Atlas Ostracod Shells, 7, 9, 1980). In contrast to Spinodiphores the outline of K. planus is more or less amplete and the nodes are much larger and not spine-like. Explanation of Plate 22, 75 Fig. 1, LV ext. lat. (paratype, GPIMH3653f, 475 pm long). Fig. 2, LV ext. lat. (holotype, GPIMH 3653d, 473 pm long). Fig. 3, LV ext. lat. (paratype, GPIMH 3653e, 512/rm long). Scale A (100 pm; xl41), figs. 1, 2; scale B (100 pm\ xl32), fig. 3. Stereo-Atlas of Ostracod Shells 22, 76 Spinodiphores praepletus (3 of 4) The Silurian Klonkina Kruta ( Neues Jb. Geol. Paldont Mh., 1986, 444, Fig. 1) differs in its anterior node which is also spine-like and situated close to the dorsal margin like the posterior spine (see also R.E.L. Schallreuter, Neues Jb. Geol. Paldont. Mh., 1991, 110, figs. 3.1-2). The Silurian Sekobollia Schallreuter (N. Jb. Geol. Paldont. Mh., 1991, 111, figs. 4.1, 4.2) also possesses an anterior node and a posterior spine, but they are connected by a distinct zygal ridge and the anterior node is not sited away from the dorsal margin as in Spinodiphores-, the two genera also differ in outline and development of the pseudovelum. Spinodiphores is placed within the Bolliidae though its outline, position of the anterior node and the development of the zygal ridge (‘connecting lobe’) are atypical. A concave centroventral free margin (ventricular concavity; G. Henningsmoen, Geol. For. Stockh. Forh., 86, 391, 1965) also occurs (but rarely) in other bolliids, for example in Quasibollia Warshauer & Berdan, 1982 (see F.M. Swain & J.R. Cornell, Rep. Invest., Minn, geol., 35, pi. 1, figs. 6a-b, 1987). Holotype: Type locality: Derivation of name: Diagnosis: Figured specimens: Distribution: Spinodiphores praepletus sp. nov. Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH), Germany no. 3653d. [Paratypes: GPIMH 3653a-c, 3653e-g], Rio Sassito, W of San Juan, Argentina; approximately lat. 3 1 ° 3 1 .3 ' S, long. 68° 57.7' W. Llandeilo or lower/ middle Caradoc ‘series’, Ordovician. Alluding to the preplete outline of the valves. As for the genus, which is presently monotypic. University of Hamburg GPIMH nos. 3653a (paratype, LV: PI. 22, 77, fig. 1), 3653b (paratype, RV. PI. 22, 77, fig. 3), 3653c (paratype, RV: PI. 22, 77, fig. 2), 3653d (paratype, LV: PI. 22, 75, fig. 2), 3653e (paratype, LV: PI. 22, 75, fig. 3) and 3653f (paratype, LV: PI. 22, 75, fig. 1). All are from type locality (sample AP Bg 206 LF). The material is silicified. Known only from the type locality, Ordovician of Argentina. Explanation of Plate 22, 77 Fig. 1, LV ext. lat. (paratype, GPIMH 3653a, 510/rm long). Fig. 2, RV ext. lat. (paratype, GPIMH 3653c, 390 //m long). Fig. 3, RV ext. lat. (paratype, GPIMH 3653b, 465 pm long). Scale A (100 //m; xl26), fig. 1; scale B (100 pm; xl72), fig. 2; scale C (100 pm; xl44), fig. 3. Stereo-Atlas of Ostracod Shells 22, 77 Stereo-Atlas of Ostracod Shells 22, 75 Spinodiphores praepletus (2 of 4) Spinodiphores praepletus (4 of 4) Stereo-Atlas of Ostracod Shells 22 (19) 78-81 (1995) Ansipe anseripediculus (1 of 4) 595.336.12 (113.31) (82 : 164.069.32): 551.351 + 552.55 ON ANSIPE ANSERIPEDICULUS SCHALLREUTER gen. et sp. nov. by Roger E.L. Schallreuter (University of Hamburg, Germany) Genus ANSIPE gen. nov. Type-species: Ansipe anseripediculus gen et sp. nov. Derivation of name: Formed artificially from name of the type-species. Diagnosis: Elongate, rounded-rectangular, subamplete to slightly preplete bollid drepanellacean. In dorsal half, slightly closer to anterior end, two small ridge-like nodes occur parallel to each other, vertical to dorsal margin or slightly oblique in anteroventral direction. No additional nodes. Parallel to free margin, at the confluence of the lateral and marginal surfaces, is a ridge-like pseudovelum. Lateral surface, except for nodes, is punctate. Remarks: Retinoda Schallreuter ( Stereo-Atlas Ostracod Shells, 13, 21-24, 1986), from the upper Ordovician of Europe (Thuringia, Baltoscandia), is characterized by two, large, bulbous nodes. In Warthinia Spivey, 1939 from the upper Ordovician of North America and Europe (Bohemia, Baltoscan- dia), the two dorsal nodes are rounded, sometimes developed as spines (for example, see Warshauer, S.M. & Berdan, J.M., Prof. Pap. U.S. geol. Surv., 1066-H, pi. 2, figs. 9-10, 1982) and are of different sizes, the posterior node being larger than the anterior node. In W. lauta (Gailite, L.K., Paleont. stratigr. Pribaltiki Belorussii, 3: pi. 2, fig. 4, 1971) the differences in the size of the nodes is not as much as in W. saccula (Burr & Swain, Minn. geol. Surv., SP-3, 1965). Furthermore, in Warthinia more than one node is developed in the anterior part of the valve (Warshauer, S.M. & Berdan, J.M., op. cit., pi. 1, figs. 12-21). Explanation of Plate 22, 79 Fig. 1, LV ext. lat. (paratype, GPIMH 3652c, 564 pm long). Fig. 2, LV ext. lat. (holotype, GPIMH 3652g, 465 pm long). Fig. 3, LV ext. lat. (paratype, GPIMH 3652d, 390 pm long). Scale A (100 pm; X 115), fig. 1; scale B (100 //m; X 145), fig. 2; scale C (100 /rm; xl75), fig. 3. Stereo-Atlas of Ostracod Shells 22, 80 Ansipe anseripediculus (3 of 4) In Klimphores Schallreuter, 1966 the two main nodes may be elongate but in such cases they are not parallel to each other as they are in Ansipe (Schallreuter, R.E.L.), Stereo-Atlas Ostracod Shells, 7, 9-16, 1980; L.K. Gailite, 1971, op. cit., pi. 1, figs. 1-5). Lardeuxella Vannier (Palaeontographica (A), 193, 1986 (pi. 2, figs. 4, 5, pi. 3, figs. 1-5, pi. 4, figs. 1, 2)) is, in its two ridge-like, parallel lobes and the ridge-like pseudovelum, very similar to Ansipe but it differs in having lobes that are very long and which extend to the ventral part of the valve. Such long lobes are atypical for the bolliids; therefore, Lardeuxella is best assigned to the Quadrijugatoridae. Ansipe also differs from Lardeuxella by its punctation. Holotype: Type locality: Derivation of name: Diagnosis: Figured specimens: Remarks: Distribution: Ansipe anseripediculus sp. nov. Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH), Germany, no. 3652g. [Paratypes: GPIMH 3652a-3652f] . Rio Sassito, W of San Juan, Argentina, approximately lat. 31°31.3'S, long. 68°57.7'W. Llandeilo or lower/middle Caradoc ‘series’, Ordovician. Latin, anser, goose, and pediculus, small foot; alluding to the similarity of the two elongate centrodorsal nodes with quotation-marks (German: Gansefiifichen). As for the genus, which is presently monotypic. University of Hamburg, GPIMH nos. 3652a (paratype, RV: PI. 22, 81, fig. 1), 3652b (paratype, RV: PI. 22, 81, fig. 2), 3652c (paratype, LV: PI. 22, 79, fig. 1), 3652d (paratype, LV: PI. 22, 79, fig. 3), 3652f (paratype, RV: PI. 22, 81, fig. 3) and 3652g (holotype, LV: PI. 22, 79, fig. 2). All are from the type locality (sample AP Bg 206 LF). The material is silicified. Retinoda sulcata Schallreuter, 1986, from the Caradoc of Thuringia, possesses rounded dorsal nodes and a more rounded outline (Schallreuter, op. cit., pis. 13, 22, 13, 24). Known only from the type locality, Ordovician of Argentina. Explanation of Plate 22, 81 Fig. 1, RV ext. lat. (paratype, GPIMH 3652a, 529 pm long). Fig. 2, RV ext. lat. (paratype, GPIMH 3652b, 543 pm long). Fig. 3, RV ext. lat. (paratype, GPIMH 3652f, 537 pm long). Scale A (100 pm; Xl24), figs. 1-3. Ansipe anseripediculus (2 of 4) Ansipe anseripediculus (4 of 4) Stereo-Atlas of Ostracod Shells 22, 79 Stereo-Atlas of Ostracod Shells 22, 81 Stereo-Atlas of Ostracod Shells 22 (20) 82-85 (1995) Harpabollia argentina (1 of 4) 595.336.12 (113.31) (82 : 164.069.32): 551.351 + 552.55 ON HARPABOLLIA ARGENTINA SCHALLREUTER sp. nov. by Roger E.L. Schallreuter (University of Hamburg, Germany) Harpabollia argentina sp. nov. Holotype: Type locality: Derivation of name: Diagnosis: Figured specimens: Remarks: Geologisch-Palaontologisches Institut und Museum, University of Hamburg (GPIMH), Germany, no. 3651b. [Paratypes: GPIMH 3651a, 3651c-g]. Rio Sassito, W of San Juan, Argentina, approximately lat. 31°31.3'S, long. 68°57.7'W. Llandeilo or lower/middle Caradoc ‘series’, Ordovician. After the country of origin of the species. Species of Harpabollia up to at least 0.47 mm long. Anterior branch of inner, horseshoe-like (zygal) lobe is dorsally bulb-like (L2). Posterior, crescent-shaped area, behind the outer horseshoe-shaped ridge, is small. University of Hamburg, GPIMH nos. 3651a (paratype, RV: PI. 22, 83, fig. 3), 3651b (holotype, RV: PI. 22, 83, fig. 2), 3651c (paratype, RV: PI. 22, 85, fig. 2), 3651d (paratype, LV: PI. 22, 83, fig. 1), 3651e (paratype, RV: PI. 22, 85, fig. 3) and 3651f (paratype, LV: PI. 22, 85, fig. 1). All are from the type locality (sample AP Bg206LF). The material is silicified. The type-species of Harpabollia Schallreuter ( Neues Jb. Geol. Palaont. Mh., 1990 (2), 121), Bollia harparum (Troedsson, Lunds Univ. Arsskr. N.F., (2) 15 (3), 55, 92, 1918; = Bollia mezvagarensis Gailite, Paleont. Stratigr. Pribaltiki Belorussii, 2, 23, 1970) from the Late Ordovician of Baltoscandia (Scania, Latvia, East Prussia), Bohemia and the Carnic Alps, differs by its less bulb-like L2 and by having a broader posterior area behind the outer horseshoe-shaped ridge (Schallreuter 1990, op. cit., fig. 2). Explanation of Plate 22, 83 Fig. 1, LV ext. lat. (paratype, GPIMH 3651d, 440 pm long). Fig. 2, RV ext. lat. (holotype, GPIMH 3651b, 471 pm long). Fig. 3, RV ext. lat. (paratype, GPIMH 3651a, 369 pm long). Scale A (100 //m; xl50), fig. 1; scale B (100 pm; xl43), fig. 2; scale C (100 /rm; xl75), fig. 3. Stereo-Atlas of Ostracod Shells 22, 84 Harpabollia argentina (3 of 4) The homeomorphic Satiellina Vannier, 1986 ( Palaeontographica , (A), 193, 106) resembles Harpabollia but in Satiellina the pseudovelum is missing anteriorly and posteriorly or only weakly developed. Harpabollia is placed within the Quadrijugatoridae whereas Satiellina seems to be a member of the Circulinidae, a taxon which is characterized by normally rather high to very high valves and relatively flat marginal surfaces. In Quasibollia Warshauer & Berdan, 1982 (Prof. Pap. U.S. geol. Surv., 1066, HI 9), from the upper Ordovician of N America and Kazakhstan, the central horseshoe-shaped lobe is more or less dissolved into single nodes (op. cit., pi. 1, figs. 1-11; Melnikova, L.M., Trudy Paleont. Inst. Akad. nauk SSSR, 218, pi. 8, fig. 6, 1986). Very similar to H. argentina and a possible species of Harpabollia is Bollia ungula Swartz & Swain, 1941 , from the middle Devonian of N America (Bull. geol. Soc. Am., 52). In B. ungula the anterior node is less bulb-like than in H. argentina (see Swartz & Swain 1941, pi. 2, fig. 4; Scott H.W. & Wainwright J. in Moore, R.C. (ed.), Treatise on Invertebrate Paleontology, pt. Q, figs. 62.2, 1961). H. argentina occurs together with Ansipe anseripediculus and Spinodiphores praepletus (both Schallreuter 1995, Stereo-Atlas Ostracod Shells, 22, 74-77, 78-81, 1995). These three species form the main part of the ostracod fauna. The remaining species consist of only a few, also small, largely unsculptured forms. Larger ostracods, especially palaeocopes, were not found; thus, the fauna possibly attests to unusual environmental and/or sedimentary conditions. H. argentina represents the first record of the genus outside Europe and indicates faunal relations between South America and Europe in middle Ordovician time. Harpabollia is a member of the Quadrijugatoridae, a typical North American family. Thus, faunal links with this continent may also be indicated by the new species. Distribution: Known only from type locality, Ordovician of Argentina. Explanation of Plate 22, 85 Fig. 1, LV ext. lat. (paratype, GPIMH 3651f, 420 pm long). Fig. 2 RV, ext. lat. (paratype, GPIMH 3651c, 374 pm long). Fig. 3 RV, ext. lat. (paratype, GPIMH 3651e, 402 pm long). Scale A (100 pm; xl60), fig. 1; scale B (100 pm; xl70), figs. 2, 3. Stereo-Atlas of Ostracod Shells 22, 83 Harpabollia argentina (2 of 4) Stereo-Atlas of Ostracod Shells 22 (21) 86-95 (1995) Juraleberis jubata (1 of 10) 595.339.1 (116.233)(470:161.048.52): 551.351 ON JURALEBERIS JUBATA VANNIER & SIVETER gen. et sp. nov. by Jean Vannier & David J. Siveter (Universite Claude Bernard, Lyon, France & University of Leicester, England) Genus JURALEBERIS gen. nov. Type-species: Juraleberis jubata gen. et sp. nov. Jura, as in Jurassic and leberis, skin; alluding to its age. Feminine. Large cylindroleberidid myodocopid (carapace > 3 mm long) with almost subcircular outline. Second antenna has tripartite protopodite bearing tiny medial node. Mandible with long, wide, upwardly directed basipodite. Maxilla has subquadrangular basipodite. 5th limb exopodite is crescent-shaped overall, with acute dorsal end and >70 radiating bristles (ventral bristles stout, curve towards centre of domicilium); exopodite is smooth, spatulate, exsagittal feature. 7th limb is very flexible, slender; diameter proximally c. 80yum. Many protrusive soft parts of Juraleberis are lacking. Nevertheless, Juraleberis clearly shows affinities with Recent cyclasteropine cylindroleberidids such as Leuroleberis Kornicker, 1981 and Cycloleberis Skogsberg, 1920 (e.g. Cyclole- beris squamiger (Scott, 1894); see Kornicker, L., Smithson. Contr. Zool., 197, 1975 and 319, 1981) and is tentatively assigned to that subfamily. Characteristics common to these genera include an evenly rounded carapace outline and a spatula-shaped 5th limb exopodite. The mandibles, maxillae basipodites and 5th limb exopodites of Juraleberis (Text-fig. 1) are relatively larger than in other cylindroleberines. Juraleberis is the oldest known cylindroleberidid. We concur that Triadocypris spitzbergensis Weitschat ( Palaont . Z., 57, 309-323, 1983), from the Triassic of Spitzbergen, is a cypridinid, although its gill-like features suggest similarities with the Cylindroleberididae. In the absence of soft part evidence the systematic position of possible Cylindroleberididae Explanation of Plate 22, 87 Figs. 1-4, carapace, It. valve removed, showing soft anatomy (holotype, PIN 3775/1, 3.3 mm long and 2.8 mm high): fig. 1, It. lat.; fig. 2, It. lat., epipodite of It. 5th limb; fig. 3, vent, obi., bristles of epipodite of It. 5th limb; fig. 4, vent, obi., bristles and interdigitated setae of epipodite of It. 5th limb. Scale A (1000 //m; Xl5), fig. 1; scale B (250/rm; x30) fig. 2; scale C (250/mt; x60), fig. 3; scale D (10/rm; x957), fig. 4. Derivation of name: Diagnosis: Remarks: Stereo-Atlas of Ostracod Shells 22, 88 Juraleberis jubata (3 of 10) Muller, 1906 from the Palaeozoic, such as Eocypridina aciculata Scott & Summerson, 1943 (see Kornicker, L., Smith- son. Contr. Zool., 319, 39, 1981), cannot be confirmed. That notwithstanding, we consider that the supposed con- cavicarid arthropod Concavicaris remipes Schram ( Proc . San Diego Soc. nat. Hist., 3, 1990), from the Carboniferous Mazon Creek Lagerstatte, is probably an ostracod of possible cypridinid or cylindroleberidid affinities; this is indicated by its carapace size (c. 10 mm long), rostrum and furcal lamella. Juraleberis jubata sp. nov. J. Dzik, Neues. Jb. Geol. Palaont. Mh., 7, 393, figs. 1-3. Palaeontological Institute (PIN), Russian Academy of Sciences, Moscow, Russia, no. 3775/1; an incomplete carapace (most of left valve and part of right valve missing) with preserved soft parts. Savelesky Mine, near Pugatchov, Saratov district, Volga River region, Russia; early Volgian (Tithonian), Upper Jurassic. From Latin, jubatus, maned; fanciful resemblance of the epipodite of the 5th limb to the mane of a horse. Palaeontological Institute, Moscow, no. 3775/1 (holotype, carapace with soft anatomy: PI. 22, 87, figs. 1-4; PI. 22, 89, figs. 1-5; PI. 22, 91, figs. 1-4; PI. 22, 93, figs. 1-6). From type locality. As for the genus, which is currently monotypic. (a) Preservation : This species is known only from the holotype, which was prepared by needles after recovery, by acid treatment, from a concretion containing a pliosaur reptile (Dzik 1978). Several other ostracod specimens were extracted from the rock matrix (Dzik, pers. comm., 1995) but could not be located in the collections in Moscow (DJS 1995). The concretion also yielded abundant coleoid hooks; thus, the ostracods may represent part of the stomach contents of the pliosaur (Dzik, 1978). These particular taphonomic conditions probably account for the early phosphatization and preservation of the ostracod soft parts (see Wilby, P.R. & Martill, D.M., Hist. Biol., 6, 25-36, 1992 for analogous exceptional preservation in fossil fish stomachs). Secondary phosphatization is also responsible for exceptional Explanation of Plate 22, 89 Figs. 1-5, carapace, It. valve removed, showing soft anatomy (holotype, PIN 3775/1, 3.3 mm long): fig. 1, It. lat., possible remains of gill attachment overhanging distal part of It. 7th limb; fig. 2, slightly vent, obi., distal part of It. 7th limb; fig. 3, ant., showing (from It. to rt.) protopodites of 2nd antennae, basipodites of mandibles, and exopodites of 5th limbs; fig. 4, lat., bristles on basipodite of rt. mandible; fig. 5, lat., unknown features (possibly bases to bristles; cf. fig. 4) along margin of basipodite of It. mandible. Scale A (250/rm; x67), fig. 1; scale B (100 gm; xl20), scale C (250 gm; x47) fig. 3; scale D (25 pm; x473), fig. 4; scale E (25 gm; X360), fig. 5. 1978 Cycloleberis sp.; Holotype: Type locality: Derivation of name: Figured specimens: Diagnosis: Remarks: Stereo-Atlas of Ostracod Shells 22, 90 Juraleberis jubata (5 of 10) preservation of Triassic myodocopids (Weitschat, op. cit., 1983), Cretaceous podocopid ostracods (Hate, R.H., Palaeontology, 15, 379-393, 1972) and numerous Cambrian arthropods (e.g. Walossek, D. & Muller, K.J., Acta zool. (Stockh.), 73(5), 305-312, 1992 and references therein). (b) Functional morphology : The maxillae and 5th limbs of Recent cylindroleberidids play an essential role in creating water currents (‘epipodial fan’) and collecting (e.g. by maxillar setae) and directing (by spatulate-like exopodites) food to the mouth (Cannon, G., Trans. R. Soc. Edinb., 57, 739-764, 1933). Similar features in J. jubata suggest that it, too, was an active ‘filter-feeder’ (cf. Text-figs. ID, 3). The interdigitated setae of the ventilatory fan of its 5th limb (PI. 22, 87, fig. 4) are identical to those of Recent cylindroleberidids. However, it is not clear whether cylindroleberidids use the abundant, ventral comb-like setae of their 4th-6th appendages (Text-fig. 3) as filters or as paddles to create feeding currents in a viscous medium (low Reynold’s number; Vannier, J. & Abe, K., J. Crust. Biol., 13, 1993). Recent cylindroleberidids, such as Leuroleberis surugaensis Hiruta, 1982, are chiefly infaunal ‘filterers’ in shallow water (< 150 m depth) and at times are also good swimmers (JV, unpubl. obs.). Some features of J. jubata, such as its well-developed antennal protopodite (PI. 22, 91, fig. 2), are probably adaptations for swimming. A row of conspicious, almond-shaped microstructures along the ventral margin of its mandibular basipodite (PL 22, 89, figs. 3, 5) are possible remains of (sensory?) triaenid bristles (cf. Text-fig. 2). The backward projection of its mandibular basipodite may represent an endite, a feature found in many cylindroleberidids. The remains of possible branchial attachment (PL 22, 89, fig. 1) are inconclusive evidence for the presence of gills in J. jubata (Kornicker op. cit., 1981). Recent cylindroleberidids of comparable size usually have 7 pairs of book gills (Vannier, J. et al., J. Crust. Biol., in press). The wrinkled external surface of the carapace of J. jubata may represent an artefact (of a poorly mineralised carapace?) rather than ornament. Similar wrinkles occur in phosphatised Triassic myodocopes (Weitschat, op. cit., 1983). Males of cylindroleberidids commonly have a more elongate carapace and stronger 2nd antennal protopodite than females (see L. surugaensis in Vannier et al., J. Crust. Biol., in press). The holotype of J. jubata has a rounded shape and is possibly a female or preadult. Distribution: Known only from the type locality. Explanation of Plate 22, 91 Figs. 1-4, carapace, part of rt. valve removed, showing soft anatomy (holotype, PIN 3775/1, 3.3 mm long & 2.8 mm high): fig. 1, rt. lat.; fig. 2, rt. lat., protopodite of rt. 2nd antenna; fig. 3, rt. lat., protopodite of rt. 2nd antenna and basipodite of rt. mandible; fig. 4, vent, obi., ornament and pore opening in rt. valve. Scale A (1000 pm; xl5), fig. 1; scale B (250 /tm; x47), fig. 2; scale C (100 /tm; x78), fig. 3; scale D (10/tm; xl025), fig. 4. Stereo-Atlas of Ostracod Shells 22, 92 Juraleberis jubata (7 of 10) Text-fig. 1. Interpretation of soft parts, in right and left lateral (A, B), ventral oblique (C) and ventral (D) views (Pis. 22, 87, fig. 1; PL 22, 91, fig. 1; PL 22, 93, figs. 1, 4). Arrows point anteriorly. Shaded areas represent soft anatomy recognised. al(ex)l?: expodite of left 1st antenna ?. al(ex)r: expodite of right 1st antenna. a2(exj)r: position of joint to exopodite of right 2nd antenna. a2(pr)l: protopodite of left 2nd antenna. a2(pr)r: protopodite of right 2nd antenna, ca: carapace, end?: endite ?. fu: furca (basal parts), ga?: gill attachment ?. md(ba)l: basipodite of left mandible. md(ba)r: basipodite of right mandible. mx(ba)l: basipodite of left maxilla, pb: posterior part of body, pf? : pericardial floor?, rv: right valve, se?: possible remains of setules on exopodite of 5th limbs, usp: unidentified soft parts. 5(ba)l? : protopodite of left 5th limb? 5(ep)l: epipodite of left 5th limb. 5(ep)r: epipodite of right 5th limb. 5(ex)l: exopodite of left 5th limb. 5(ex)r: exopodite of right 5th limb. 6r?: right 6th limb? 7(d)l: distal part of left 7th limb. 7(p)l: proximal part of left 7th limb. ga0 Explanation of Plate 22, 93 Figs. 1-6, carapace (partly removed) showing soft anatomy (holotype, PIN 3775/1, 3.3 mm long): fig. 1, rt. vent, obi., carapace; fig. 2, rt. vent, obi., vent, part of epipodite of rt. 5th limb showing stout bristles; fig. 3, vent., vent, part of epipodite of rt. 5th limb showing stout bristles; fig. 3, vent., vent, part of epipodite of rt. 5th limb showing stout bristles; fig. 4, vent. (ant. to the It.); fig. 5, It. lat. obi., epipodite of It. 5th limb and basal part of furca; fig. 6, It. lat., proximal part of It. 7th limb. Scale A (1000 /rm; Xl5), fig. 1; scale B (75//m; xl32), fig. 2; scale C (75 gm; Xl50), fig. 3; scale D (500 /tm; xl8), fig. 4; scale E (250 pm\ x47), fig. 5; scale F (25 pm; x300), fig. 6. Stereo-Atlas of Ostracod Shells 22, 94 Juraleberis jubata (9 of 10) Text-fig. 2. Lateral view of mandible of the Recent cylindroleberidid Leuroleberis sharpei Kornicker (1981, fig. 30). Arrow points anteriorly, ba: basipodite. bvm: basal ventral margin, en: 1st podomere of endopodite. enb: bristles of endopodite. end: endite with triaenid tip. ex: exopodite. tb: triaenid bristles. Stereo-Atlas of Ostracod Shells 22, 95 Juraleberis jubata (10 of 10) Text-fig. 3. Reconstruction of the ventral morphology of the Recent cylindroleberidid Cyclasterope hendersoni Brady, 1897 (modified from Cannon 1933, fig. 6a). The maxilla and the 5th limb plays an important role by ventilating the domicilar cavity and filtering food particles. Arrow points anteriorly, am: left adductor muscles bundle, fu: furcal lamellae, mxl: left maxilla, g: gill, pb: posterior part of body. 5(ep)l: epipodite of left 5th limb. 5(ex)l: exopodite of left 5th limb. 61: left 6th limb. 6r: right 6th limb. Acknowledgements: We thank the Royal Society/CNRS and NATO for their support, L. Melnikova (Moscow) for loan of the material, J. Dzik (Warsaw) for correspondence and L. Kornicker (Washington) and M-C. Guillaume (Paris) for information on Recent cylindroleberidids. Stereo-Atlas of Ostracod Shells 22 (22) 96-103 (1995) Kirkbyrhiza primaeva (1 of 8) 595.336.14 (113.333) (766 : 162.097.34 + 768 : 162.089.35): 551.351 +552.52 ON KIRKBYRHIZA PRIMAEVA (ROTH) by Gerhard Becker & Robert F. Lundin (Senckenberg Museum, Frankfurt-am-Main, Germany & Arizona State University, Tempe, U.S.A.) Derivation of name: Diagnosis: Remarks: Genus KIRKBYRHIZA gen. nov. Type-species: Amphissites primaevus Roth, 1929 From Greek rhiza, root; alluding to the root-stock of the kirkbyaceans. Gender, feminine. Kirkbyacean ostracod with broad and diffuse lateral lobes; posterior lobe more conspicuous than anterior lobe. Vertical (sulcal) depression rather distinct (Upper Silurian type-species) to obsolete (additional, early Devonian species), terminating ventrally in well developed adductorial pit; corresponding adductorial boss on the interior surface prominent, but interior reflection of sulcal depression dorsal to the adductorial boss weak or even absent. Dorsal surface epicline. Primarginal (outer) carina poorly developed ventrally, distinct anteriorly and posteriorly; extending onto dorsal surface at both cardinal corners, very weak on anterodorsal surface. Very fine marginal ridge on left valve. Right valve with distinct contact groove, slightly larger than left; below cardinal angles, contact slightly discontinuous; hinge structure straight and with weak cardinal projections (terminal teeth) on left valve and weak cardinal depressions (terminal sockets) on right valve. Kirkbyrhiza is a typical kirkbyacean, as shown by its carapace shape, the presence of admarginal structures and the subcentral position of the adductor muscle field which apparently is an apomorphic character. Kirkbyrhiza primaeva (Roth, 1929) is the oldest known kirkbyacean species and near the origin of this group. The sulcal depression, terminating ventrally in the adductorial pit (only conspicuous in the type-species), is considered to be an ancestral character (S2) inherited from its presumed (hypothetical) drepanellid ancestors. The ambivalent affinity of the new genus to both the Amphissitidae Knight, 1928 (with lobes and subcentral node) and the Arcyzonidae Kesling, 1961 (without the subcentral node), shown also by the early Devonian Eoarcyzona Becker & Wang ( Palaeontographica , A 124, 18, 1992), confirms the close Explanation of Plate 22, 97 Fig. 1 adult car., rt. ext. lat. (X-248, 1390 pm long). Fig. 2, adult LV, int. lat., detail showing anterior cardinal tooth (arrow) (X-249, 1505 pm long). Fig. 3, adult LV, ext. lat. (X-257, 1365 pm long). Scale A (300 /rm; x59), fig. 1; scale B (100 /tm; x205), fig. 2; scale C (300 /rm; x60), fig. 3. Stereo-Atlas of Ostracod Shells 22, 98 Kirkbyrhiza primaeva (3 of 8) relationship between the Amphissitidae and the Arcyzonidae. Because of its rather simple carapace morphology, Kirkbyrhiza is placed in the Arcyzonidae. Distribution: Presently known from the type-species, which occurs in the Upper Silurian (Ludlow and Pfidoli series) of western Tennessee and south-central Oklahoma, and by an additional species, Amphissites retiferus Roth, 1929, from the Lower Devonian (Lochkovian) of the same areas. Kirkbyrhiza is probably endemic to the North American midcontinent area. Kirkbyrhiza primaeva (Roth, 1929) 1929 Amphissites primaevus sp. nov. R. Roth, J. Paleont., 3, 346, pi. 36, fig. 10a. 1961 Reticestus? primaevus (Roth); I.G. Sohn, Prof. Pap. U.S. geol. Surv., 330-B, 140, pi. 11, figs. 29-32. 1965 Amphissella primaeva (Roth); R.F. Lundin, Bull. Okla geol. Surv., 108, 39, pi. 6, figs. la-j. Holotype: Type locality: Figured specimens: Diagnosis: Remarks: United States National Museum of Natural History, Washington (USNM) no. 80658H; juvenile right valve. This specimen was illustrated by Lundin (1965) but not by Roth (1929), who illustrated only a paratype (USNM 80658A), a juvenile left valve. The locality data given by Roth (1929) strongly suggests that the holotype is from Upper Silurian (late Ludlow-Pridoli) strata of the Henryhouse Fm. The species is certainly present in that unit at Lundin’s (1965, op. cit.) section P3; approximate lat. 34°35' N, long. 96°50' W (see also T.W. Amsden, Bull. Okla geol. Surv., 84, panel 2, 1960). Department of Geology, Arizona State University (ASU), nos. X-248 (car.: PI. 22, 97, fig. 1), X-249 (LV: PI. 22, 97, fig. 2), X-250 (LV: PL 22, 99, fig. 1, PL 22, 103, fig. 2), X-251 (RV: PI. 22, 99, figs. 2, 3), X-252 (car.: PI. 22, 101, figs. 1, 4), X-253 (LV: PI. 22, 103, fig. 1), X-254 (RV: PL 22, 103, fig. 4), X-255 (RV: PL 22, 103, fig. 3), X-256 (RV: PI. 22, 103, fig. 5) and X-257 (LV: PI. 22, 97, fig. 3). USNM 80658H (holotype, juv. RV: PL 22, 101, fig. 2), USNM 80658A (paratype, juv. LV: PL 101, fig. 3). ASU X-248 and X-250 to X-257 are from Lundin’s (1965) sample P5-9, 15.1 m above the base of the Brownsport Fm at section P5, a glade 9.2 km SE of Decaturville, Peryville Quadrangle, Decatur County, Tennessee, U.S.A. ; lat. 35° 30'49.5" N, long. 88°3'24"W. ASUX-249 is from the middle part of the Brownsport Fm (sample 06-8) at section 06, a roadcut along U.S. Highway 64, approximately 3.7 km SW of Olivehill, Olivehill Quadrangle, Hardin County, Tennessee, U.S.A.; lat. 35° 15' 29.5" N, long. 88°4'6" W. USNM 80658H and 80658A are from the type locality. All figured specimens are of Ludlow or Pridoli, Upper Silurian age. Kirkbyrhiza species with a comparatively conspicuous sulcal depression and slightly irregular reticulation pattern. The reticulation pattern approximately parallels the free margin. On the lateral surface of the lobes near the sulcal depression. Explanation of Plate 22, 99 Fig. 1, adult LV, int. lat. (X-250, 1350 pm long). Figs. 2, 3, adult RV (X-251, 1355 pm long): fig. 2, int. lat., detail showing anterior cardinal depression (arrow); fig. 3, int. lat. Scale A (300 gm; x66), fig. 1; scale B (100 gm; xl02), fig. 2; scale C (300 pm; x62), fig. 3. Kirkbyrhiza primaeva (2 of 8) Stereo-Atlas of Ostracod Shells 22. 97 Stereo-Atlas of Ostracod Shells 22, 99 Kirkbyrhiza primaeva (4 of 8) Stereo-Atlas of Ostracod Shells 22, 100 Kirkbyrhiza primaeva (5 of 8) the reticula are arranged in dorsoventral rows. This reticulation pattern distinguishes this species from the closely related Lower Devonian species, Kirkbyrhiza retifera (Roth, 1929), in which the reticula form a concentric pattern around the adductorial pit. Moreover, the sulcal depression is practically obsolete in the younger species. Probably, the anterior cardinal depression/ projection is more conspicuous than the posterior one (see PI. 22, 99). Distribution: This species is known from Upper Silurian (Ludlow-Pfidoli) strata of south-central Oklahoma (Henryhouse Fm) and western Tennessee (Brownsport Fm) (see text-figs. 2, 3). Lundin (Bull. Okla geol. Surv., 116, 1968) has shown that this species does not occur in the Haragan Formation, as stated by Roth (1929), and Petersen & Lundin (in Chaplin, J.R. & Barrick, J.E., Bull. Okla geol. Surv., 145 1992) have shown that this species does not occur in Lower Devonian strata of western Tennessee, as indicated by Wilson (/. Paleont., 9, 638, 1935). Wilson’s report certainly refers to the closely related Kirkbyrhiza retifera. The non-lobate Reticestus planus (Wilson, 1935), reported from the Lower Devonian of western Tennessee (Peterson & Lundin, 1992) is a separate, valid species. Kirkbyrhiza species are considered to be neritic, and characteristic of shallow-water environments below the wave base. Acknowledgements: The authors thank Mr. Harry Birkmann (Arizona State University) for technical assistance. Length, gm Text-fig. 1. Size dispersion of a population of Kirkbyrhiza primaeva from sample P5-9; late Silurian Brownsport Fm, Tennessee. Explanation of Plate 22, 101 Figs. 1, 4, adult car. (X-252, 1450 pm long): fig. 1, dors.; fig. 4, vent. Fig. 2, juv. RV (holotype, USNM80658H, 865 pm long). Fig. 3, juv. LV (paratype, USNM80658A, 808 pm long). Scale A (300 /mi; x63), figs. 1, 4; scale B (200 pm; x56), fig. 2; scale C (200 /mi; x60), fig. 3. Stereo-Atlas of Ostracod Shells 22, 102 Kirkbyrhiza primaeva (7 of 8) R5E * n B R7E R8E R 9 E PONTOTOC K/ttstown T 2 N Text-fig. 2. Map of Arbuckle Mountains (with Pontotoc county detail), Oklahoma, showing upper Silurian/early Devonian outcrops (black) and ostracod localities (stars); Ludlow-Pfidoli = Henryhouse Fm with K. primaeva, Lochkov = Haragan Fm with K. retifera. After Lundin (1965, 1968). Text-fig. 3. Ostracod localities in the Tennessee valley; Ludlow = Brownsport Fm with K. primaeva , Lochkov = Birdsong Fm with K. retifera. After Petersen & Lundin (1992). Explanation of Plate 22, 103 Fig. 1, adult LV, vent. (X-253, 1420 pm long). Fig. 2, adult LV dors. (X-250, 1350 pm long). Fig. 3, adult RV, post. (X-255, 1365 pm long). Fig. 4, adult RV, dors. (X-254 1380/mi long). Fig. 5, adult RV, ant. (X-256, 1335 //m long). Scale A (300 /mi; x64), figs. 1, 4; scale B (300 //m; x54), fig. 2; scale C (300 /tm; x62), fig. 3; scale D (300 /mi; x65), fig. 5. Stereo-Atlas of Ostracod Shells 22, 101 Kirkbyrhiza primaeva (6 of 8) i:> mg jf Stereo-Atlas of Ostracod Shells 22 (23) 104-107 (1995) Polycope moenia (1 of 4) 595.339.2 (119.9) (268 : 162.014.85): 551.351 + 551.353 ON POLYCOPE MOENIA JOY & CLARK by Richard Jones & Robin C. Whatley (Institute of Earth Studies, University of Wales, Aberystwyth, U.K.) Polycope moenia Joy & Clark, 1977 1977 Polycope? moenia n. sp., J.A. Joy & D.L. Clark, Micropaleontology , 23, 145, PI. 3, figs. 17-19. Type specimens: Type locality: Figured specimens: Diagnosis: Department of Geology and Geophysics, University of Wisconsin, Madison (UW): Holotype, UW 1597- 17b, Paratypes UW 1597-17a and UW 1597-17c. Core FL 290, 20-1, central Arctic Ocean (lat. 84°23.40'N, long. 1 43 ° 5 1 . 1 9' W). Water depth 2262m; Recent. The Natural History Museum, London [BMNH] nos. 1996.90 (adult RV: PL 22, 105, fig. 1; PI. 22, 107, fig. 3), 1996.91 (adult LV: PI. 22, 105, figs. 2, 3), 1996.92 (adult RV: PI. 2, figs. 1, 2). All specimens collected from the Morris Jesup Rise, Arctic Ocean (lat. 85° 19.4' N, long. 14° W) on the ARK VIII/3 (ARCTIC ’91) cruise; Recent. Carapace sub-circular with an irregular margin, widest at mid-height. Anterior margin nearly straight, fringed by a series of short spines; two prominent antero-dorsal spines make up part of a slightly arched dorsal margin. Ventral margin irregular due to a number of small anteroventral denticles which merge into a posteroventral keel, that ends at mid-height in the right valve only. Valve surface strongly reticulate with muri orientated in rows parallel to the periphery near the dorsal margin, becoming lower and less organised towards the ventral surface. Second order reticulation is weak and discontinuous across the Explanation of Plate 22, 105 Fig. 1, adult RV, ext. lat. (1996.90, 315//m long). Figs. 2, 3, adult LV (1996.91, 310^m long): fig. 2, ext. lat.; fig. 3, post. vent, ornament. Scale A (100 pm\ xl60), figs. 1, 3; scale B (50yum; x320), fig. 2. Stereo-Atlas of Ostracod Shells 22, 106 Polycope moenia (3 of 4) whole valve. Antero-dorsally, the flange is enhanced by the presence of minute transverse ridges. Cara- pace articulated by a simple adont hinge; three sub-equal muscle scars occur ventro-centrally. Remarks: Polycope moenia is one of a large group of polycopids that occur at high latitudes in the Arctic Ocean. It is easily distinguished from its co-habitants in the Arctic basins, but is morphologically similar to other species in the Greenland/Norway Seas and the North Atlantic Ocean. The main reason for confusion between these species is that they all display high degrees of reticulation. However, it is subtle variations within the ornamentation of the valves that allows the separation of the species. Polycope areolata and Polycope clathrata, both Sars, 1923 {An Account of the Crustacea of Norway, 9, 33-34), possess coarser and finer densities of reticulation respectively compared with P. moenia. P. areolata is sculptured by wide polygonal meshes whereas P. clathrata has a surface of very dense and crowded muri. Neither exhibits any form of secondary reticulation and both lack prominent antero- dorsal spines. Joy and Clark (op. cit.) did not consider P. moenia to be a typical Poly cope species because of its irregular outline, obscured hinge and muscle scars. Further investigation has revealed the presence of an adont hinge and an arrangement of three muscle scars (PI. 22, 107, figs. 1 and 2). This allows us to assign P. moenia to the genus Polycope with greater confidence. Distribution: Polycope moenia, like the other Arctic polycopids, can be significant numerically, but its ecological sig- nificance is still poorly understood. This is mainly due to its very patchy distribution both geographically and stratigraphically. Although essentially benthonic, Polycope is known to be a rapid swimmer charac- terising highly oxygenated waters usually at 1000-1500 m depth, where the North Atlantic water mass flows through the Fram Strait into the Eurasian Basin. The genus is always found in fine grained, organi- cally rich sediments. The ecological and morphological evidence available suggests that Polycope is able to migrate in or out of nutrient-rich areas relatively quickly. P. moenia is present in the two major basins (Canadian and Eurasian) of the Arctic Ocean and in the Greenland Sea. It characterises interglacial-age (warm) sediments. Explanation of Plate 22, 107 Fig. 1, 2, adult RV (1996.92, 315//m long): fig. 1, hinge; fig. 2, int. lat. Fig. 3, adult RV (1996.90), anterodorsal spine. Scale A (50^im; x240), fig. 1; scale B (100 gm; xl60), fig. 2; scale C (20 pm; x500), fig. 3. Stereo-Atlas of Ostracod Shells 22, 105 Polycope moenia (2 of 4) IK&V *»*• Vsi-^- §m»tm MRSSfi tfC@3$8Sra g&«esfeal Stereo-Atlas of Ostracod Shells 22 (24) 108-111 (1995) Cytheropteron nudum (1 of 4) 595.337.14 (118.15) (265 : 162. 180. 18): 551.352 + 552.54 ON CYTHEROPTERON NUDUM BOOMER sp. nov. by Ian Boomer (School of Environmental Sciences, University of East Anglia, Norwich, England) Cytheropteron nudum sp. nov. 1995 Cytheropteron sp. 2, I. Boomer & R. Whatley, Proc. Ocean Drill. Prog. (Sci. Res.)., 143, pi. 3, fig. 13-14. Holotype: Type locality: Derivation of name: Figured specimens: Diagnosis: The Natural History Museum, London [BMNH] no. OS 14852; adult RV. [Paratype: no. OS 14853]. Allison Guyot, Central Pacific Ocean (lat. 18°26.41'N, long. 179° 33.33' W), Ocean Drilling Program, Leg 143, Site 865B, Core 2, core-catcher (0-8 cm); Lower Oligocene. With reference to the absence of any external ornament. The Natural History Museum, London [BMNH] nos. OS 14852 (holotype, RV: PI. 22, 109, figs. 1, 2, PI. 22, 111, fig. 2), OS 14853 (paratype, LV: PI. 22, 109, fig. 3; PI. 22, 111, figs. 1, 3). A large, distinctly alate species of Cytheropteron lacking any evidence of external ornament. The distal part of the alar process terminates in a stout tubular process while the antero-ventral alar margin bears a small flange (PI. 22, 111, figs. 2, 3). The carapace is sub-rhomboidal in lateral view with an arched dorsal margin, particularly marked in the larger right valve. A stout, upturned caudal process is present at the postero-dorsal extremity. The hinge elements are smooth and quite delicate. The marginal zone is broad and fused throughout. Explanation of Plate 22, 109 Fig. 1, 2, adult RV (holotype, OS 14852, 110 pm long): fig. 1, ext. lat.; fig. 2, dors. Fig. 3, adult LV, ext. lat. (paratype, OS 14853, 720 //m long). Scale A (100 pm\ x92), figs. 1, 2; scale B (100 pm; x86), fig. 3. Stereo-Atlas of Ostracod Shells 22, 110 Cytheropteron nudum (3 of 4) Remarks: The genus is common in Cainozoic deep sea assemblages, indeed, the present taxon was one of eleven Cytheropteron species recorded in the Upper Palaeocene to Lower Oligocene interval of ODP Site 865B (Boomer, I. & Whatley, R., op. cit.). Although many species of Cytheropteron possess well developed patterns of ornament on the lateral and ventral surfaces, Cytheropteron nudum lacks any such markings and is best distinguished by its size, lateral outline and alar development. Distribution: Known only from the Upper Palaeocene to Lower Oligocene of ODP Site 865B, Mid-Pacific Mountains. Explanation of Plate 22, 111 Fig. 1, 3, adult LV (paratype, OS 14853, 120 pm long): fig. 1, dors.; fig. 3, vent. Figs 2, adult RV, oblique int. vent, (holotype, OS 14852, 110 pm long). Scale A (100 pm\ x92), figs. 1, 3; scale B (100 pm\ x82), fig. 2. Cytheropteron nudum (2 of 4) Stereo-Atlas of Ostracod Shells 22, 109 Stereo-Atlas of Ostracod Shells 22 (25) 1 12-115 (1995) Eucytherura allisonensis (1 of 4) 595.337.14 (118.15) (265 : 162.180.18): 551.352 + 552.54 ON EUCYTHERURA ALLISONENSIS BOOMER sp. nov. by Ian Boomer (School of Environmental Sciences, University of East Anglia, Norwich, England) Eucytherura allisonensis sp. nov. 1995 Eucytherura sp. 7, I. Boomer & R. Whatley, Proc. Ocean Drill. Prog. (Sci. Res.), 143, pi. 4, fig. 27-28. Ho lo type: Type locality: Derivation of name: Figured specimens: The Natural History Museum, London [BMNH] no. OS 14854; adult RV. [Paratype: no. OS 14855]. Allison Guyot, Central Pacific Ocean (lat. 18°26.41'N, long. 179° 33.33' W), Ocean Drilling Program, Leg 143, Site 865B, Core 2, core-catcher (0-8 cm); Lower Oligocene. With reference to the type locality Allison Guyot, Central Pacific Ocean. The Natural History Museum, London [BMNH] nos. OS 14854 (holotype, RV: PI. 22, 113, fig. 1, PI. 22, 115, figs. 1-3), OS 14855 (paratype, LV: PI. 22, 113, figs. 2, 3). Explanation of Plate 22, 113 Fig. 1, adult RV, ext. lat. (holotype, OS 14854, 310^m long). Figs. 2, 3, adult LV (paratype, OS 14855, 315//m long): fig. 2. dors.; fig. 3, ext. lat. Scale A (50/rm; x205), figs. 1; scale B (50 pm; x220), figs. 2, 3. Stereo-Atlas of Ostracod Shells 22, 114 Eucytherura allisonensis (3 of 4) Diagnosis: Remarks: Distribution: A sub-ovate species of Eucytherura with well rounded anterior and posterior margins. The species is distinguished by the presence of anterior and postero-dorsal flanges, both of which project above the hinge line. The anterior and posterior margins are compressed. The lateral surfaces bear fine and medium sized reticulae. The carapace is inflated postero-ventrally bearing a raised box-type reticulation. A short oblique rib occurs anteriorly. The hinge has a large ovate posterior tooth in the right valve (anterior tooth missing in figured specimen PI. 22, 115, figs. 1, 3). The median element is robust and locellate with a marked thinning about the mid-length. The calcified inner lamella is of moderate width and fused throughout. The dorsal surfaces between the marginal flanges and hinge line bear a series of circular depressions. These appear to be much deeper features than the lateral depressions although they are not expressed internally. Known only from the Oligocene bathyal sediments of ODP Site 865, Mid-Pacific Mountains. Explanation of Plate 22, 115 Figs. 1-3, adult RV (holotype, OS 14854, 310/ym long): fig. 1, int. lat.; fig. 2, dors.; fig. 3, hinge. Scale A (50//m; x205), figs. 1, 2; scale B (50 pm; x370), fig. 3. Stereo-Atlas of Ostracod Shells 22 (26) 116-119 (1995) Hemiparacytheridea larwoodi (1 of 4) 595.337.14 (118.15) (265 : 162.180.18): 551.352 + 552.54 ON HEMIPARACYTHERIDEA LARWOODI BOOMER sp. nov. by Ian Boomer (School of Environmental Sciences, University of East Anglia, Norwich, England) Hemiparacytheridea larwoodi sp. nov. 1995 Hemiparacytheridea sp. 14, I. Boomer & R. Whatley, Proc. Ocean Drill. Prog. (Sci. Res.)., 143, pi. 4, fig. 17. Ho lo type: Type locality: Derivation of name: Figured specimens: The Natural History Museum, London ([BMNH] no. OS 14850, adult RV. [Paratype: no. OS 14851]. Allison Guyot, Central Pacific Ocean. Ocean Drilling Program, Leg 143, Site 865B (lat. 18° 26.41 ' N, long. 179° 33.33' W), Core 2, section 5, 100-106 cm; Lower Oligocene. Dedicated to Mr. J. Larwood who first recorded this species during the course of his Ph.D. research. The Natural History Museum, London [BMNH] nos. OS 14850 (holotype, RV: PI. 22, 117, figs. 1, 3; PI. 22, 119, figs. 2, 3), OS 14851 (paratype, LV: PI. 22, 117, figs. 2, 4; PI. 22, 119, fig. 1). Explanation of Plate 22, 117 Figs. 1, 3, adult RV, (holotype, OS 14850, 440 gm long): fig. 1, ext. lat.; fig. 3, dors. Figs. 2, 4, adult LV (paratype, OS 14851, 440 /mi long): fig. 2, dors.; fig. 4, ext. lat. Scale A (100 pm; x 157), figs. 1-4. Stereo-Atlas of Ostracod Shells 22, 118 Hemiparacytheridea larwoodi (3 of 4) Diagnosis: Remarks: Distribution: The species is elongate, sub-rhomboidal in lateral view and is distinguished by an oblique ventro- lateral rib which marks the distal limit of a weak ventro-lateral inflation. The rib terminates posteriorly in a strong backward projecting spine. The lateral surfaces bear regular, sub-rounded reticulae which become elongate on the ventral surfaces. The anterior cardinal angle is distinctly acute in both valves, the caudal process is short and upturned at the postero-dorsal extremity. The hinge has a locelate median element which is expanded posteriorly, the terminal elements are much reduced. The marginal zone is broad and fused throughout. The genus is common in deep sea assemblages from Palaeocene to Recent. Despite its occurrence in the deep sea, the present species shows evidence of an occular sinus at the anterior cardinal angle. This feature must be redundant in the bathyal environment but alludes to the origin of this group in the photic zone. Known from Oligocene to Miocene bathyal sediments in the Pacific Ocean, ODP sites 865, 871, 872 (Mid-Pacific Mountains), DSDP Site 77 (Horizon Guyot) and DSDP Site 200 (Ita Mai Tai Guyot, Larwood pers. comm.). Explanation of Plate 22, 119 Fig. 1, adult LV, int. lat. (paratype, OS 14851, 440 /ym long). Figs. 2, 3, adult RV (holotype, OS 14850, 440 long): fig. 2, vent.; fig. 3, int. lat. Scale A (100 pm; xl48), fig. 1; scale B (100 /ym; X157), figs. 2, 3. Stereo-Atlas of Ostracod Shells 22, 117 Hemiparacytheridea larwoodi (2 of 4) Stereo-Atlas of Ostracod Shells 22 (27) 120-123 (1995) Limnocythere eiggensis (1 of 4) 595.337.14 (116.222) (411 : 162.007.56): 551.312 + 552.52 ON LIMNOCYTHERE EIGGENSIS WAKEFIELD nom. nov. by Matthew I. Wakefield (British Gas P.L.C., Gas Research Centre, Loughborough, England) Limnocythere eiggensis nom. nov. 1994 Limnocythere spinosa sp. nov., M.I. Wakefield, Palaeontogr Soc. (Monogr.), 148, (593), 33-35, pi. 4, figs. 20-27. non 1957 Limnocythere spinosa sp. nov., K.N. Negadaev-Nikonov, Uchen. Zap. kishin. gos. Univ., 25, 47-52. Holotype: Type locality: Derivation of name: Figured specimens: The Natural History Museum, London [BMNH], no. OS 13832: 9 left valve. [Paratypes: nos. OS 13833-38.] North Shore, Isle of Eigg, Scotland. National Grid Reference: NM 471 906 (lat. 56° 57' N, long. 6° 10' W). Type level is 5 cm above the base of Bed 8b of Hudson (in: Emeleus, C.H. (ed.), in press. The Geology of Rum, and the Adjacent Islands. Memoir for Sheet 60. British Geological Survey, London, HMSO), Lonfearn Member, Lealt Shale Formation, Great Estuarine Group, Middle Jurassic (Bathonian). After the type locality, Isle of Eigg, Inner Hebrides, Scotland. The Natural History Museum, London [BMNH] nos. OS 13832 (holotype, 9 LV: PI. 22, 121, fig. 1), OS 13833 (paratype, A-2, LV: PI. 22, 121, figs. 3, 4), OS 13834 (paratype, A-2, RV: PI. 22, 121, fig. 5, 6), OS 13835 (para- type, cr LV: PI. 22, 121, fig. 2), OS 13836 (paratype, A-l, LV: PI. 22, 122, figs. 6-8), OS 13837 (paratype, A-2, RV: PI. 22, 122, figs. 1-5), OS 13838 (paratype, 9 RV: PI. 22, 121, figs. 7, 8). OS 13832, OS 13836 and OS 13837 from type locality and horizon. OS 13833, OS 13834, OS 13835 and Explanation of Plate 22, 121 Fig. 1, 9 LV, ext. lat. (holotype, OS 13832, 733 pm long). Fig. 2, cr LV, ext. lat. (paratype, OS 13835, 618 pm long). Figs. 3, 4, A-2 LV (paratype, OS 13833, 527 pm long): fig. 3, ext. lat.; fig. 4, dors. Figs. 5, 6, A-2 RV (paratype, OS 13834, 445 pm long): fig. 5, ext. lat.; fig. 6, dors. Figs. 7, 8, 9 RV (paratype, OS 13838, 691 pm long): fig. 7, ext. lat.; fig. 8, dors. Scale A (100 //m; x70), figs. 1, 2, 7, 8; scale B (100 /on; x90), figs. 3-6. Stereo-Atlas of Ostracod Shells 22, 122 Limnocythere eiggensis (3 of 4) Diagnosis: Remarks: Distribution: Ackno wledgemen t: OS 13838 from 20 cm above base Bed 7, Lonfearn Member, Lealt Shale Formation, Great Estuarine Group, Rudha nam Braithairean, Trotternish, Skye (Wakefield, 1994, op. cit.). Carapace subrectangular in lateral view with strongly developed ventrolateral alae. Hemispherical swelling developed posterior of alar projection. At least eight anterior and two posterior marginal pore canals present (after Wakefield, 1994, op. cit.). Posteroventral hemispherical swelling variably developed, or may be absent. Male illustrated herein (OS 13835 PI. 22, 121, fig. 2) is one of the smallest recovered. Outline of alae in dorsal view variable due to preservation. The strongly alate nature of L. eiggensis prompts questioning of its generic assignment, extant species of the genus usually possess only weakly developed alae. L. eiggensis bears some similarities to Limnicytheropteron Swain, 1986 ( Revta esp. Micropaleont. 18, 100-102, PI. 4, figs. 10, 11 & 15; PI. 5, figs. 4-16), however, the present species clearly differs in being avesibulate, in possessing a distinctly compressed anterior marginal zone, and in being dorso-medianly sulcate. None of the Limnocythere species described by Martens, 1990 (Arch. Hydrobiol., Suppl. 83, 543-524) possess ventro-lateral alae, though many do have a tubercle developed in the same position as the alae in L. eiggensis i.e. ventro-laterally above the ventral inflexure. Delorme 1971 (Can. J. Zool. 49, 43-64) describes several Limnocythere species which possess ventro-lateral alae above the ventral inflexure, though well developed, these features are not as large as in L. eiggensis. There is clearly great variability in alar development within the genus and to omit the present species from Limnocythere purely on the development of this feature is not valid. The generic diagnosis of Limnocythere should be amended to include the development of alae. Known only from the Middle Jurassic (Bathonian) Lonfern Member, Lealt Shale Formation, Great Estuarine Group, Inner Hebrides, Scotland. NERC and BP for CASE Award GT4/88/GS/62 held in the Department of Geology, Leicester University, England (1988-91). The latter is thanked for the use of its darkroom facilities during the preparation of this paper. Explanation of Plate 22, 123 Fig. 1-5, A-2 LV (paratype, OS 13837, 509 pm long): fig. 1, int. lat.; fig. 2, muse, sc.; fig. 3, oblique int. ant.; fig. 4, dors.; fig. 5, oblique int. post. Figs. 6-8, A-l LV (paratype, OS 13836, 636 pm long): fig. 6, post.; fig. 7, vent.; fig. 8, ext. lat. Scale A (100 pm\ x90), figs. 1, 4; scale B (50 /on; x350), fig. 2; scale C (100 /on; x 125), figs. 3, 5; scale D (100 pm; x80), figs. 6-8. Stereo-Atlas of Ostracod Shells 22, 121 Limnocythere eiggensis (2 of 4) Stereo-Atlas of Ostracod Shells 22, 123 Limnocythere eiggensis (4 of 4) Stereo-Atlas of Ostracod Shells 22 (28) 124-126 (1995) Index, Volume 22, 1995 (1 of 3) General Index Allaruella australiensis Krommelbein; 29-32 allisonensis, Eucytherura; 112-115 anseripediculus, Ansipe\ 78-81 Ansipe anseripediculus Schallreuter gen. et sp. nov.; 78-81 Arcacythere rugosa Majoran sp. nov.; 33-36 argentina, Harpabollia; 82-85 artesica, Artesiocythere', 25-28 Artesiocythere artesica Krommelbein; 25-28 australiensis, Allaruella', 29-32 Ballent, S., Maybury, C.A. & Whatley, R.C., On Allaruella australiensis Krommelbein; 29-32 Baltocyamus primarius Meidla gen. et sp. nov.; 1-4 Becker, G. & Lundin, R.F., On Kirkbyrhiza primaeva (Roth); 96-103 Becker, G., On Ordovizona immanis Becker, 17-20 Birkmann, H. & Lundin, R.F., On Microcheilinella gigas Birkmann & Lundin sp. nov.; 13-16 Boomer, I., On Cytheropteron nudum Boomer sp. nov.; 108-111 Boomer, I., On Eucytherura allisonensis Boomer sp. nov.; 112-115 Boomer, I., On Hemiparacytheridea larwoodi Boomer sp. nov.; 116-119 bronwynae, Cytheropteron-, 41-44 cavi, Cavhithis', 70-73 Cavhithis cavi Schallreuter; 70-73 complanata, Semicytherura; 53-60 Cytherelloidea kayei Weaver; 45-52 Cytheropteron bronwynae Joy & Clark; 41-44 Cytheropteron nudum Boomer sp. nov.; 108-111 Dizygopleura landesi Roth; 5-8 eiggensis, Limnocythere; 120-123 Eucytherura allisonensis Boomer sp. nov.; 112-115 gigas, Microcheilinella', 13-16 grand is, Longiscella', 9-12 Harpabollia argentina Schallreuter sp. nov.; 82-85 Hemiparacytheridea larwoodi Boomer sp. nov.; 116-119 Horne, D.J. & Lord, A.R., On Semicytherura complanata (Brady, Crosskey & Robertson); 53-60 Horne, D.J., Rosenfeld, A. & Slipper, I., On Cytherelloidea kayei Weaver; 45-52 Huh, M., Whatley, R.C. & Paik, K-H., On Kotoracythere tatsunokuchiensis Ishizaki; 62-65 Huh, M., Whatley, R.C., & Paik, K-H., On Kotoracythere koreana Huh, Whatley & Paik sp. nov.; 66-69 immanis, Ordovizona', 17-20 lnversibolbina lehnerti Schallreuter gen. et sp. nov.; 21-24 Jones, R. & Whatley, R.C., On Polycope moenia Joy & Clarke; 104-107 Jones, R. & Whatley, R.C., On Cytheropteron bronwynae Joy & Clark; 41-44 jubata, Juraleberis; 86-95 Juraleberis jubata Vannier & Siveter gen. et sp. nov.; 86-95 kayei, Cytherelloidea-, 45-52 Kirkbyrhiza primaeva (Roth); 96-103 koreana, Kotoracythere', 66-69 Kotoracythere koreana Huh, Whatley & Paik sp. nov.; 66-69 Kotoracythere tatsunokuchiensis Ishizaki; 62-65 Kuiperiana paravariesculpta Maybury; 37-40 landesi, Dizygopleura', 5-8 larwoodi, Hemiparacytheridea', 116-119 lehnerti, lnversibolbina', 21-24 Limnocythere eiggensis Wakefield sp. nov.; 120-123 Longiscella grandis (Jones & Holl); 9-12 Lord, A.R. & Horne, D.J., On Semicytherura complanata (Brady, Crosskey & Robertson); 53-60 Lundin, R.F. & Petersen, L.E., On Longiscella grandis (Jones & Holl); 9-12 Lundin, R.F. & Becker, G., On Kirkbyrhiza primaeva (Roth); 96-103 Lundin, R.F. & Birkmann, H., On Microcheilinella gigas Birkmann & Lundin sp. nov.; 13-16 Lundin, R.F., On Dizygopleura landesi Roth; 5-8 Lundin, R.F., On Poloniella schallreuteri Schallreuter nom. nov.; 61 Majoran, S., On Aracythere rugosa Majoran sp. nov.; 33-36 Maybury, C.A., On Kuiperiana paravariesculpta Maybury; 37-40 Maybury, C.A., Whatley, R.C. & Ballent, S., On Allaruella australiensis Krommelbein; 29-32 Meidla, T., On Baltocyamus primarius Meidla gen. et sp. nov.; 1-4 Microcheilinella gigas Birkmann & Lundin sp. nov.; 13-16 moenia, Polycope', 104-107 nudum, Cytheropteron', 108-111 Stereo-Atlas of Ostracod Shells 22, 125 Index, Volume 22, 1995 (2 of 3) Ordovizona immanis Becker; 17-20 Paik, K-H., Huh, M. & Whatley, R.C., On Kotoracythere tatsunokuchiensis Ishizaki; 62-65 Paik, K-H., Huh, M. & Whatley, R.C., On Kotoracythere koreana Huh, Whatley & Paik sp. nov.; 66-69 paravariesculpta, Kuiperiana; 37-40 Petersen, L.E. & Lundin, R.F., On Longiscella grandis (Jones & Holl); 9-12 Poloniella schallreuteri Lundin nom. nov.; 61 Poly cope moenia Joy & Clarke; 104-107 praepletus, Spinodiphores-, 74-77 primaeva, Kirkbyrhiza-, 96-103 primarius, Baltocyamus; 1-4 Rosenfeld, A., Horne, D.J. & Slipper, I., On Cytherelloidea kayei Weaver; 45-52 rugosa, Arcacythere-, 33-36 Schallreuter, R.E.L., On Ansipe anseripedicutus Schallreuter gen. et sp. nov.; 78-81 Schallreuter, R.E.L., On Cavhithis cavi Schallreuter; 70-73 Schallreuter, R.E.L., On Harpabollia argentina Schallreuter sp. nov.; 82-85 Schallreuter, R.E.L., On Inversibolbina lehnerti Schallreuter gen. et sp. nov.; 21-24 Schallreuter, R.E.L., On Spinodiphores praepletus Schallreuter gen. et sp. nov.; 74-77 schallreuteri, Poloniella-, 61 Semicytherura complanata (Brady, Crosskey & Robertson); 53-60 Siveter, D.J. & Vannier, J., On Juraleberis jubata Vannier & Siveter gen. et sp. nov.; 86-95 Slipper, I., Horne, D.J. & Rosenfeld, A., On Cytherelloidea kayei Weaver; 45-52 Spinodiphores praepletus Schallreuter gen. et sp. nov.; 74-77 tatsunokuchiensis, Kotoracythere-, 62-65 Vannier, J. & Siveter, D.J., On Juraleberis jubata Vannier & Siveter gen. et sp. nov.; 86-95 Wakefield, M.I., On Limnocythere eiggensis Wakefield sp. nov.; 120-123 Whatley, R.C. & Jones, R., On Polycope moenia Joy & Clarke; 104-107 Whatley, R.C. & Maybury, C.A., On Artesiocythere artesica Krommelbein; 25-28 Whatley, R.C. & Jones, R., On Cytheropteron bronwynae Joy & Clark; 41-44 Whatley, R.C. & Maybury, C.A., On Artesiocythere artesica Krommelbein; 25-28 Whatley, R.C., Huh, M. & Paik, K-H., On Kotoracythere koreana Huh, Whatley & Paik sp. nov.; 66-69 Whatley, R.C., Huh, M. & Paik, K-H., On Kotoracythere tatsunokuchiensis Ishizaki; 62-65 Whatley, R.C., Maybury, C.A. & Ballent, S., On Allaruella australiensis Krommelbein; 29-32 Stereo-Atlas of Ostracod Shells 22, 126 Index, Volume 22, 1995 (3 of 3) (113.31) (113.312) (113.313) (113.331) (1 13.333) (116.222) (116.233) (116.313) (261) (265) (268) (411) (420) (438) (470) (474.2) (485) (489) See 1 (1) 5-22 (1973) for explanation of Ordovician: Ansipe anseripediculus; 78-81 Cavhithis cavi; 70-73 Harpabollia argentine i; 82-85 Ordovizona immanis; 17-20 Spinodiphores praepletus; 14-11 Middle Ordovician: Inversibolbina lehnerti; 21-24 Upper Ordovician: Baltocyamus primarius; 1 -4 Lower Silurian: Longiscella grandis; 9-12 Upper Silurian: Dizygopleura landesi ; 5-8 Kirkbyrhiza primaeva; 96-103 Microcheilinella gigas; 13-16 Poloniella schallreuteri; 61 Bajocian: Limnocythere eiggensis; 120-123 Kimmeridgian: Juraleberis jubata; 86-95 Albian: Allaruella australiensis; 29-32 Artesiocythere artesica; 25-28 Index; Geological Horizon the Schedules in the Universal Decimal Classification (116.311) Cenomanian: Cytherelloidea kayei; 45-52 (116.332) Turonian: Cytherelloidea kayev, 45-52 (116.333.1) Coniacian: Cytherelloidea kayev, 45-52 (118.14) Eocene: Arcacythere rugosa; 33-36 (118.15) Oligocene: Cytheropteron nudum ; 108-111 Eucytherura allisonensis; 112-115 Hemiparacytheridea larwoodi; 116-119 (118.21) Miocene: Kotoracythere koreana; 66-69 (118.22) Pliocene: Kotoracythere tatsunokuchiensis; 62-65 Kuiperiana paravariesculpta; 37-40 (119.1) Quarternary: Semicytherura complanata; 53-60 (119.4) Holocene: Semicytherura complanata-, 53-60 (119.9) Recent: Cytheropteron bronwynae] 41-44 Polycope moenia-, 104-107 Semicytherura complanata-, 53-60 Index; Geographical Location See 1 (1) 5-22 (1973) for explanation of the Schedules in the Universal Decimal Classification Atlantic Ocean: Ordovizona immanis-, 17-20 Pacific Ocean: Cytheropteron nudum ; 108-111 Eucytherura allisonensis; 112-115 Hemiparacytheridea larwoodi; 116-119 Arctic Ocean: Cytheropteron bronwynae; 41-44 Poly cope moenia; 104-107 Scotland: Limnocythere eiggensis; 120-123 England: Cytherelloidea kayei; 45-52 Kuiperiana paravariesculpta; 37-40 Longiscella grandis; 9—12 Poland: Cavhithis cavi; 70-73 Russia: Juraleberis jubata; 86-95 Estonia: Baltocyamus primarius; 1-4 Sweden: Microcheilinella gigas; 13-16 Semicytherura complanata; 53-60 Denmark: Semicytherura complanata; 53-60 (519) Korea: Kotoracythere koreana; 66-69 (520) Japan: Kotoracythere tatsunokuchiensis; 62-65 (714) Quebec: Semicytherura complanata; 53-60 (766) Oklahoma: Dizygopleura landesi; 5-8 Kirkbyrhiza primaeva; 96-103 (768) Tennessee: Dizygopleura landesi; 5-8 Kirkbyrhiza primaeva; 96-103 Poloniella schallreuteri; 61 (798) Alaska: Semicytherura complanata; 53-60 (82) Argentina: Inversibolbina lehnerti; 21-24 Ansipe anseripediculus; 78-81 Harpabollia argentina; 82-85 Spinodiphores praepletus; 74-77 (942) South Australia: Arcacythere rugosa; 33-36 (943) Queensland: Allaruella australiensis; 29-32 Artesiocythere artesica; 25-28 BPC BLACKPOOL LTD COLOUR PRINTERS are pleased to be associated with this Publication and wish every success for the future of the Stereo-Atlas of Ostracod Shells Stanley Road, Blackpool, Lancashire FY1 4QN Telephone 01253 22351 Facsimile 01253 295733 A MEMBER OF THE BRITISH PRINTING COMPANY LTD Stero-Atlas of Ostracod Shells: Vol. 22, Part 2 CONTENTS 22 22 22 22 22 22 22 22 22 22 22 22 22 22 (15) 62-65 On Kotoracythere tatsunokuchiensis Ishizaki; by M. Huh, R.C. Whatley & K-H. Paik. (16) 66-69 On Kotoracythere koreana Huh, Whatley & Paik sp. nov.; by M. Huh, R.C. Whatley & K-H. Paik. (17) 70-73 On Cavhithis cavi Schallreuter; by R.E.L. Schallreuter. (18) 74-77 On Spinodiphores praepletus Schallreuter gen. et sp. nov.; by R.E.L. Schallreuter. (19) 78-81 On Ansipe anseripediculus Schallreuter gen. et sp. nov.; by R.E.L. Schallreuter. (20) 82-85 On Harpabollia argentina Schallreuter sp. nov.; by R.E.L. Schallreuter. (21) 86-95 On Juraleberis jubata Vannier & Siveter gen. et sp. nov.; J. Vannier & D.J. Siveter. (22) 96-103 On Kirkbyrhiza primaeva (Roth); by G. Becker & R.F. Lundin. (23) 104-107 On Polycope moenia Joy & Clark; by R. Jones & R.C. Whatley. (24) 108-111 On Cytheropteron nudum Boomer sp. nov.; by I. Boomer. (25) 112-115 On Eucytherura allisonensis Boomer sp. nov.; by I. Boomer. (26) 116-119 On Hemiparacytheridea larwoodi Boomer sp. nov.; by I. Boomer. (27) 120-123 On Limnocythere eiggensis Wakefield sp. nov.; by M.I. Wakefield. (28) 124-126 Index for Volume 22 (1995). 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